>> thanks to its faster clock rate, the P5/e5500 comes out as winner in absolute
>> comparison in the majority of tests (except dnetc).

> the X5000 can't even beat the antique G4

As you quoted, the 2.0 GHz X5000 is faster than the 1.5 GHz Mac mini G4 most of the time in the benchmark results compared in this thread (ignoring AltiVec, that is).